| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| //go:build ignore |
| // +build ignore |
| |
| package main |
| |
| // This program generates the subdirectories of Go packages that contain []byte |
| // versions of the TrueType font files under ./ttfs. |
| // |
| // Currently, "go run gen.go" needs to be run manually. This isn't done by the |
| // usual "go generate" mechanism as there isn't any other Go code in this |
| // directory (excluding sub-directories) to attach a "go:generate" line to. |
| // |
| // In any case, code generation should only need to happen when the underlying |
| // TTF files change, which isn't expected to happen frequently. |
| |
| import ( |
| "bytes" |
| "fmt" |
| "go/format" |
| "io/ioutil" |
| "log" |
| "os" |
| "path/filepath" |
| "strings" |
| ) |
| |
| const suffix = ".ttf" |
| |
| func main() { |
| ttfs, err := os.Open("ttfs") |
| if err != nil { |
| log.Fatal(err) |
| } |
| defer ttfs.Close() |
| |
| infos, err := ttfs.Readdir(-1) |
| if err != nil { |
| log.Fatal(err) |
| } |
| for _, info := range infos { |
| ttfName := info.Name() |
| if !strings.HasSuffix(ttfName, suffix) { |
| continue |
| } |
| do(ttfName) |
| } |
| } |
| |
| func do(ttfName string) { |
| fontName := fontName(ttfName) |
| pkgName := pkgName(ttfName) |
| if err := os.Mkdir(pkgName, 0777); err != nil && !os.IsExist(err) { |
| log.Fatal(err) |
| } |
| src, err := ioutil.ReadFile(filepath.Join("ttfs", ttfName)) |
| if err != nil { |
| log.Fatal(err) |
| } |
| |
| desc := "a proportional-width, sans-serif" |
| if strings.Contains(ttfName, "Mono") { |
| desc = "a fixed-width, slab-serif" |
| } |
| |
| b := new(bytes.Buffer) |
| fmt.Fprintf(b, "// generated by go run gen.go; DO NOT EDIT\n\n") |
| fmt.Fprintf(b, "// Package %s provides the %q TrueType font\n", pkgName, fontName) |
| fmt.Fprintf(b, "// from the Go font family. It is %s font.\n", desc) |
| fmt.Fprintf(b, "//\n") |
| fmt.Fprintf(b, "// See https://blog.golang.org/go-fonts for details.\n") |
| fmt.Fprintf(b, "package %s\n\n", pkgName) |
| fmt.Fprintf(b, "// TTF is the data for the %q TrueType font.\n", fontName) |
| fmt.Fprintf(b, "var TTF = []byte{") |
| for i, x := range src { |
| if i&15 == 0 { |
| b.WriteByte('\n') |
| } |
| fmt.Fprintf(b, "%#02x,", x) |
| } |
| fmt.Fprintf(b, "\n}\n") |
| |
| dst, err := format.Source(b.Bytes()) |
| if err != nil { |
| log.Fatal(err) |
| } |
| if err := ioutil.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil { |
| log.Fatal(err) |
| } |
| } |
| |
| // fontName maps "Go-Regular.ttf" to "Go Regular". |
| func fontName(ttfName string) string { |
| s := ttfName[:len(ttfName)-len(suffix)] |
| s = strings.Replace(s, "-", " ", -1) |
| return s |
| } |
| |
| // pkgName maps "Go-Regular.ttf" to "goregular". |
| func pkgName(ttfName string) string { |
| s := ttfName[:len(ttfName)-len(suffix)] |
| s = strings.Replace(s, "-", "", -1) |
| s = strings.ToLower(s) |
| return s |
| } |